I install this addon in UI compilation, best for me - Rufio UI classic. Can i update it separatly?
Humm...update is work, but not as i like (HP bar = Mana|stamina bar. i like when HP bar > Mana bar)

As you already know it can be updated on its own.
Whoa is all about 50/50 hp/mana but if you're looking for something hp 3/4 and mana 1/4 you should take a look at Unitframes improved or other similar. I've seen a couple of them around.

Edit: no matter what you choose you need to delete both folders besides "addon" (addon folder should stay) on "interface" folder.